Guiding means for sliding shuttering for building structures with slightly inclined and vertical concrete walls



3,399,438 DING Se t. 3, 1968 G. ROHLF GUIDING MEANS FOR SLIDINGSHUTTERING FOR BUIL STRUCTURES WITH SLIGHTLY INCLINED AND VERTICALCONCRETE WALLS 4 Sheets-Sheet 1 Filed July 14, 1965 Sept. 3, 1968 (3ROHLF' 3,399,438

GUIDING MEANS FOR SLIDING SHUTTERING FOR BUILDING STRUCTURES WITHSLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS Filed July 14, 1965 4Sheets-Sheet 2 Fly. 3

p 1968 G. ROHLF GUIDING MEANS FOR SLIDING SHUTTERING FOR BUILDINGSTRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLS 4Sheets-Sheet 5 Filed July 14, 1965 Sept. 3, 1968 ROHLF GUIDING MEANS FORSLIDING SHUTTERING FOR BUILDING STRUCTURES WITH SLIGHTLY INCLINED ANDVERTICAL CONCRETE WALLS Fild July 14, 1965 4 Sheets-Sheet 4 UnitedStates Patent 3,399,438 GUIDING MEANS FOR SLIDING SHUTTERING FORBUILDING STRUCTURES WITH SLIGHTLY INCLINED AND VERTICAL CONCRETE WALLSGiinter Rohlf, Goebenstrasse 18,

Dusseldorf, Germany Filed July 14, 1965, Ser. No. 471,818

5 Claims. (Cl. 25-131) ABSTRACT OF THE DISCLOSURE Sliding framework forbuilding concrete structures wherein a plurality of horizontallyadjustable shuttering plate guides are mounted from a support with aplurality of shuttering plates being suspended from the guides, andmeans for lifting the plates.

Each guide has two parallel limbs to the inner side of which facing oneanotherthe plates are secured with the limbs being interconnected via agirder to which theliftingmeans is affixed. The limbs have downwardexten sions of sufficient length to reach a hardened concrete wallportion and with which movably mounted members on the extensions wouldbe engageable to guide the plate guides.

This invention relates to sliding formwork for building molded concretestructures with slightly inclined walls, such as chimneys for example.With the systems of slidable formwork hitherto known it has usually onlybeen possible to produce walls with vertical surfaces. Insofar as attempts have been made to build structures with slightly inclined wallsurfaces, this has been done with inadequate means and there was noassurance that the inclination would be maintained constant. By use ofthe guiding formwork according to this invention it is possible toproduce 3,399,438 Patented Sept. 3, 1968 the transverse girders areprovided at their ends with a number of bores, which can be selectedaccording to the desired distance between the two limbs. In view of thestresses to which the guiding device is subjected, it is advantageous tostiffen the outer limb, for instance wholly or partly with latticeworkor a solid wall construction. The lower part of the inner limb may alsohave a stiffening structure, the upper girders of which then form asupporting grating for a working platform. The shuttering plates arepreferably stiffened on the outside by vertically extending girdersections. Through the webs of these girder sections tubes are passed ina horizontal direction, these tubes being uniformly adapted to thecurvature of the shuttering plates and acting as a supplementary annularstiffening.

One embodiment of the invention is illustrated by way of example, inconnection with the building of a concrete chimney, in the accompanyingdrawings, in which:

FIGURE 1 shows a guiding device in side elevation;

FIGURE 2 shows in plan a sector-shaped portion of a horizontallyarranged grating;

FIGURE 3 shows a front view of the shuttering plate, with an indicationof the position of the vertically extending stiffening girders and thehorizontally extending tubular girders;

FIGURE 4 and 5 show horizontal sections through the shuttering plates,which indicate the arrangement of the structures with slightly inclinedWall surfaces withthe assurance that a definite inclination will bereliablymaintained. Such a possibility is particularly advantageous whenconcrete chimneys of great height are-to be built, and in which theslightest error in the adjustment of the inclination would benoticeable. r

The invention consists essentially in the feature that the members forguiding the shuttering plates are adjustably arranged at the margin of ahorizontally sup ported disc or plate, that the guiding members consistof two stiffened parallel limbs, to the inner sides of which (facing oneanother) the shuttering plates are secured, these limbs being connectedwith one another by a trans- .verse girder, to which the liftingappliances are attached,

and that underneath the shuttering plates gliders or rollers guided bythe concrete Wall are provided at the lower ends of the limbs. 1

In a preferred form of construction of the invention, for the buildingof chimneys, the horizontally supported plate is a circular disc, andthe guiding members are radially adjustable relatively to the edge ofthis disc. The horizontally arranged disc, as regards its lateralposition, is guided by the already hardened concrete beneath theshuttering skin.

It is particularly advantageous to construct the disc as a grating,wherein radially extending girders are provided which pass between thelimbs of the guiding device. To enable the guiding devices to beradially adjusted relatively to the grating, there may be provided,between the grating and the limbs, an adjusting member in the nature ofa turnbuckle, while on the other side, between the transverse girders ofthe limbs and the radially ex tending girders, guiding devices areprovided.

The guiding device is preferably adjustable for a definite wallthickness. In order to provide this adjustability, for the purpose ofchanging the distance between the limbs,

vertical stiffening girders and the position of the horizontal tubulargirders;

FIGURE 6 is a sectional view corresponding to the section line VIVI inFIGURE 5;

FIGURE 7 is a view on an enlarged scale of part of the deviceillustrated in FIGURE 1 for the production of the limbs; and

FIGURE 8 is a view corresponding to the section line VIIIVIII in FIGURE7.

In the device illustrated in FIGURE 1, for the guidance of a slidablemold, use is made of hydraulic lifting appliances. The hydraulic liftingappliances illustrated may, however, be replaced by mechanical means.The apparatus as a whole is supported upon a ferro-concrete post 20,shown in cross-section and cast in local shuttering.

This post should be about 1.50 meters high. As a lifting appliance thereis employed, in a known manner, a jack rod 21. At the upper part of thejack rod is shown a recovery tube 22. All these parts, however, are notdirectly connected with the invention, and may be replaced by otherlifting devices. At the upper end of the pack rod there is a liftingdevice 9, which may be a hydraulically operated jack.

The actual guiding device consists of two parallel limbs 1a and 1b,which are connected with one another approximately centrally by atransverse girder 8. The limbs are connected the top by two paralleltransverse girders 2a and 2b. The distance between the limbs 1a and 1bis determined by the thickness of the concrete wall to be produced. Inorder that the appliance may be adjustable to different thicknesses, aplurality of holes are provided in all the transverse girders 8, 2a, and2b, so that the distance between the limbs 1a and 1b can be varied. Thetransverse girder 8, in this constructional example, serves as a yokewhich is fixedly connected with the lifter 9.

In the upper part of the device there is a sector-shaped grating,comprising individual girders 10a which extend radially. Between eachgirder 10m and the associated transverse girder 2a is a sleeve 3, withright-handed and left-handed screw threads, in the manner of aturnbuckle, one end of the bolt of which is secured upon a transverseflange of the girder 10a, while the other end is secured to thetransverse girder 2a. By rotating the turnbuckle 3 the relativepositions of the girder 10a and the limbs 1a and 1b can accordingly bealtered.

For thispurpose, between the flanges of the transverse girders 2a and 2band the flanges of the girder a, rollers or similar devices (not shown)are mounted to facilitate sliding. In this constructional example thelimb 1a is braced by a truss consisting of the girders 6a, 6b, 6c, 6dand 6e. Instead of this truss, a solid wall construction may of coursein part be employed. On the other side, namely, at the lower part of thelimb 1b, a truss 7a, 7b, 7c is likewise provided, which at the same timeserves to support a working platform. At the lower ends of the limbs 1aand 1b there are rollers or gliders 4a and 4b, which are adjustable to adefinite thickness of the wall 20 by means of set screws 5.

These rollers or gliders, as seen in FIGURE 1 extend to at least thevertical extent of the shuttering plates below the lower edge of theshuttering plates 12a and 12b so that the rollers or gliders contact thesurfaces of the concrete so far below the shuttering plates that theconcrete against which they bear is substantially hardened or, in commonparlance, has taken its permanent set.

The construction of the horizontal grating will be apparent from FIGURE2. This illustration shows that girders 10a, 10b and 100 are arrangedradially. These radial girders are stiifened by transverse girders 11aand 11b. Some of the radial girders 10b extend right to a centrallyarranged plate or disc 18.

The shuttering plates 12a and 12b, also shown in FIG- URE 1, arestiffened by vertical girders 13a, 14a and 15a. This arrangement of thestifiening girders will be apparent from FIGURE 3. For radialstiffening, horizontal lengths of tubing 16 and 17 are used, thearrangement of which, as seen from the front, is shown in FIGURE 3. Therelation between the individual stiffening girders with the shutteringplates 12a and 12a will be apparent from FIGURES 4 and 5. The skin ofthe shuttering consists of laminated high sheet-iron plates, in whichshuttering plates 12a are fixedly arranged and the interveningshuttering plates 12a are displaceably arranged. The shuttering plates1211 are fixed to the yoke structure by bolts extending through channelbars 13a and 13b. The displaceable intervening shuttering plates haveupper and lower bent-over edges, which are slipped on to the fixedplates 12a This arrangement will be apparent from FIG- URE '6. Asalready mentioned, tubes 16 and 17 are provided, which are passedthrough bores in the angles and girders. These tubes are so dimensionedthat due to their resilience they can assume any curvature, so that,since all these tubes are of the same dimensions, a circular shapefor-med by these tubes is obtained. In order that these tubes may not behampered by the interlocking of the shuttering, they are staggered inheight. This arrangement is also shown in FIGURE 6.

FIGURE 7 is a view on a larger scale of the upper portion of theapparatus shown in FIGURE 1 and shows 4 how the girder 10a is guidedbetween the girders 2 1 and 2b formed as slideways by means of rollers24.

FIGURE 8 shows a section through a girder 10a of the girder grating,which is guided upon the girders 2a and 2b which are constructed asslideways, and which are secured to the parallel limbs 1a and 1b. Thetaper,- that is, the obliquity of the limbs, is obtained by actuatingthe turnbuckle 3, while the rollers 4a and 4b are guided by the hardenedconcrete.

I claim:

1. A mold for making annular concrete walls of considerable height andof varying diameter comprising a plurality of pairs of limbs, each pairof limbs lying in a vertical plane, and parallel to the inner and theouter surface of the annular wall being molded, shuttering platesmounted on each of said limbs, the shuttering plate mounted on one ofsaid limbs to face the shuttering plate mounted on the other said limbof said pairs, the shuttering plates supported by each said pair oflimbs slidably overlapping the shutterin plates supported by adjacentpairs of limbs, means to raise all of said pairs of limbssimultaneously, said limbs each extending downwardly from the lower edgeof said shuttering plates a distance equal to at least the verticalextent of said shuttering plates and glider means at the extreme lowerends of each said limb contacting the already substantially hardenedconcrete structure.

2. The mold of claim 1 in which said glider means are rollers.

3. The mold of claim 1 in which said limbs are in the form of trusses.

4. The mold of claim 1 in which the limbs of each pair of limbs areadjustable in the vertical plane in which they lie to adjust the slopeof the concrete wall being molded.

5. The mold of claim 1 in which means is provided to assemble the saidlimbs at dilferent distances from each other so that walls of a selectedthickness can be molded.

References Cited UNITED STATES PATENTS 949,521 2/ 1910 Collins.1,127,369 2/1915 Nash. 1,891,160 12/1932 Jesperson 249-17 X 2,617,16811/1952 Johnson 25-131 X 2,621,389 12/1952 Van Heidenstam et al. 25-1313,252,199 5/ 1966 Bossner 249-20 X FOREIGN PATENTS 602,963 4/ 1934Germany.

203,088 9/ 1923 Great Britain.

864,377 4/ 1961 Great Britain WILLIAM J. STEPHENSON, Primary Examiner.

